Display screen or portion thereof with transitional graphical user interface



FIG. 1 is a front view of a first embodiment of a display screen or portion thereof with transitional graphical user interface showing a first image in a sequence, showing our new design;

FIG. 2 is a front view showing a second image thereof;

FIG. 3 is a front view showing a third image thereof;

FIG. 4 is a front view showing a fourth image thereof;

FIG. 5 is a front view showing a fifth image thereof;

FIG. 6 is a front view showing a sixth image thereof;

FIG. 7 is a front view showing a seventh image thereof;

FIG. 8 is a front view showing an eighth image thereof;

FIG. 9 is a front view showing a ninth image thereof;

FIG. 10 is a front view showing a tenth image thereof;

FIG. 11 is a front view showing an eleventh image thereof;

FIG. 12 is a front view showing a twelfth image thereof;

FIG. 13 is a front view showing a thirteenth image thereof;

FIG. 14 is a front view showing a fourteenth image thereof;

FIG. 15 is a front view showing a fifteenth image thereof;

FIG. 16 is a front view showing a sixteenth image thereof;

FIG. 17 is a front view of a second embodiment of a display screen or portion thereof with transitional graphical user interface showing a first image in a sequence;

FIG. 18 is a front view showing a second image thereof;

FIG. 19 is a front view showing a third image thereof;

FIG. 20 is a front view showing a fourth image thereof;

FIG. 21 is a front view showing a fifth image thereof;

FIG. 22 is a front view showing a sixth image thereof;

FIG. 23 is a front view showing a seventh image thereof;

FIG. 24 is a front view showing an eighth image thereof;

FIG. 25 is a front view showing a ninth image thereof;

FIG. 26 is a front view showing a tenth image thereof;

FIG. 27 is a front view showing an eleventh image thereof;

FIG. 28 is a front view showing a twelfth image thereof;

FIG. 29 is a front view showing a thirteenth image thereof;

FIG. 30 is a front view showing a fourteenth image thereof;

FIG. 31 is a front view showing a fifteenth image thereof; and,

FIG. 32 is a front view showing a sixteenth image thereof.

The outer broken lines illustrating a display screen or portion thereof form no part of the claimed design. The remainder of the broken lines depict portions of the graphical user interface that form no part of the claimed design.

The appearance of the transitional image sequentially transitions between the images shown in FIGS. 1-16 and 17-32. The process or period in which one image transitions to another image forms no part of the claimed design. 

CLAIM The ornamental design for a display screen or portion thereof with transitional graphical user interface, as shown and described. 